WIDE-AREA DIFFERENTIAL GPS: A PERFORMANCE STUDY

V. Ashkenazi, C. J. Hill, W. Y. Ochieng, and J. Nagle

Peer Reviewed

Abstract: Conventional differential GPS (DGPS) systems operate on the principle that the two main error sources (i.e., the satellite ephemeris and the atmospheric delay) are spatially correlated. Pseudorange measurements made at precisely located reference stations are compared with corresponding ranges computed from the known coordinates, and the errors derived are transmitted as differential corrections for application by DGPS users within range. The drawback of such systems is the limited range over which the differential corrections are valid, due to the rapid decor-relation of the error sources with increasing distance from the reference station to the user. This research and development study has led to the development of a wide-area DGPS (WADGPS) system design, which will generate corrections for users over a large portion of the earth. The system is based on a limited number of reference stations, which are sufficient to spatially model the ephemeris and atmospheric errors. The resulting corrections have been found to lead to accuracies comparable to those obtained by conventional DGPS, with no dependence on the distance between the user and reference sites.
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 40, Number 3
Pages: 297 - 320
Cite this article: Ashkenazi, V., Hill, C. J., Ochieng, W. Y., Nagle, J., "WIDE-AREA DIFFERENTIAL GPS: A PERFORMANCE STUDY", NAVIGATION, Journal of The Institute of Navigation, Vol. 40, No. 3, Fall 1993, pp. 297-320.
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